<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE html
    PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
  <title>Qt 4.3: renderarea.cpp Example File (painting/basicdrawing/renderarea.cpp)</title>
  <link href="classic.css" rel="stylesheet" type="text/css" />
</head>
<body>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td align="left" valign="top" width="32"><a href="http://www.trolltech.com/products/qt"><img src="images/qt-logo.png" align="left" width="32" height="32" border="0" /></a></td>
<td width="1">&nbsp;&nbsp;</td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a>&nbsp;&middot; <a href="classes.html"><font color="#004faf">All&nbsp;Classes</font></a>&nbsp;&middot; <a href="mainclasses.html"><font color="#004faf">Main&nbsp;Classes</font></a>&nbsp;&middot; <a href="groups.html"><font color="#004faf">Grouped&nbsp;Classes</font></a>&nbsp;&middot; <a href="modules.html"><font color="#004faf">Modules</font></a>&nbsp;&middot; <a href="functions.html"><font color="#004faf">Functions</font></a></td>
<td align="right" valign="top" width="230"><a href="http://www.trolltech.com"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></a></td></tr></table><h1 align="center">renderarea.cpp Example File<br /><sup><sup>painting/basicdrawing/renderarea.cpp</sup></sup></h1>
<pre><span class="comment"> /****************************************************************************
 **
 ** Copyright (C) 2005-2008 Trolltech ASA. All rights reserved.
 **
 ** This file is part of the documentation of the Qt Toolkit.
 **
 ** This file may be used under the terms of the GNU General Public
** License versions 2.0 or 3.0 as published by the Free Software
** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file.  Alternatively you may (at
** your option) use any later version of the GNU General Public
** License if such license has been publicly approved by Trolltech ASA
** (or its successors, if any) and the KDE Free Qt Foundation. 
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/. If
** you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** In addition, as a special exception, Trolltech, as the sole
** copyright holder for Qt Designer, grants users of the Qt/Eclipse
** Integration plug-in the right for the Qt/Eclipse Integration to
** link to functionality provided by Qt Designer and its related
** libraries.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not expressly
** granted herein.
 **
 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 **
 ****************************************************************************/</span>

 #include &lt;QtGui&gt;

 #include &quot;renderarea.h&quot;

 RenderArea::RenderArea(QWidget *parent)
     : QWidget(parent)
 {
     shape = Polygon;
     antialiased = false;
     transformed = false;
     pixmap.load(&quot;:/images/qt-logo.png&quot;);

     setBackgroundRole(QPalette::Base);
     setAutoFillBackground(true);
 }

 QSize RenderArea::minimumSizeHint() const
 {
     return QSize(100, 100);
 }

 QSize RenderArea::sizeHint() const
 {
     return QSize(400, 200);
 }

 void RenderArea::setShape(Shape shape)
 {
     this-&gt;shape = shape;
     update();
 }

 void RenderArea::setPen(const QPen &amp;pen)
 {
     this-&gt;pen = pen;
     update();
 }

 void RenderArea::setBrush(const QBrush &amp;brush)
 {
     this-&gt;brush = brush;
     update();
 }

 void RenderArea::setAntialiased(bool antialiased)
 {
     this-&gt;antialiased = antialiased;
     update();
 }

 void RenderArea::setTransformed(bool transformed)
 {
     this-&gt;transformed = transformed;
     update();
 }

 void RenderArea::paintEvent(QPaintEvent * <span class="comment">/* event */</span>)
 {
     static const QPoint points[4] = {
         QPoint(10, 80),
         QPoint(20, 10),
         QPoint(80, 30),
         QPoint(90, 70)
     };

     QRect rect(10, 20, 80, 60);

     QPainterPath path;
     path.moveTo(20, 80);
     path.lineTo(20, 30);
     path.cubicTo(80, 0, 50, 50, 80, 80);

     int startAngle = 30 * 16;
     int arcLength = 120 * 16;

     QPainter painter(this);
     painter.setPen(pen);
     painter.setBrush(brush);
     if (antialiased) {
         painter.setRenderHint(QPainter::Antialiasing, true);
         painter.translate(+0.5, +0.5);
     }

     for (int x = 0; x &lt; width(); x += 100) {
         for (int y = 0; y &lt; height(); y += 100) {
             painter.save();
             painter.translate(x, y);
             if (transformed) {
                 painter.translate(50, 50);
                 painter.rotate(60.0);
                 painter.scale(0.6, 0.9);
                 painter.translate(-50, -50);
             }

             switch (shape) {
             case Line:
                 painter.drawLine(rect.bottomLeft(), rect.topRight());
                 break;
             case Points:
                 painter.drawPoints(points, 4);
                 break;
             case Polyline:
                 painter.drawPolyline(points, 4);
                 break;
             case Polygon:
                 painter.drawPolygon(points, 4);
                 break;
             case Rect:
                 painter.drawRect(rect);
                 break;
             case RoundRect:
                 painter.drawRoundRect(rect);
                 break;
             case Ellipse:
                 painter.drawEllipse(rect);
                 break;
             case Arc:
                 painter.drawArc(rect, startAngle, arcLength);
                 break;
             case Chord:
                 painter.drawChord(rect, startAngle, arcLength);
                 break;
             case Pie:
                 painter.drawPie(rect, startAngle, arcLength);
                 break;
             case Path:
                 painter.drawPath(path);
                 break;
             case Text:
                 painter.drawText(rect, Qt::AlignCenter, tr(&quot;Qt by\nTrolltech&quot;));
                 break;
             case Pixmap:
                 painter.drawPixmap(10, 10, pixmap);
             }
             painter.restore();
         }
     }

     painter.setPen(palette().dark().color());
     painter.setBrush(Qt::NoBrush);
     painter.drawRect(QRect(0, 0, width() - 1, height() - 1));
 }</pre>
<p /><address><hr /><div align="center">
<table width="100%" cellspacing="0" border="0"><tr class="address">
<td width="30%">Copyright &copy; 2008 <a href="trolltech.html">Trolltech</a></td>
<td width="40%" align="center"><a href="trademarks.html">Trademarks</a></td>
<td width="30%" align="right"><div align="right">Qt 4.3.5</div></td>
</tr></table></div></address></body>
</html>
